The Cylinder Blocks introduce the child to the first stage of visual discrimination of size.Made of solid beechwood with a satin smooth lacquer finish.Each block has slightly rounded edges and each cylinder is individually sanded and lacquered. Cylinder Block No.1-Cylinder progress in height and diameter from small to large. Cylinder Block No.2-Cylinder progress in diameter from thin to thick. Cylinder Block No.3-Cylinder diminish in height yet increase in diameter from tall to thin and short to thick. Cylinder Block No.4-Cylinder progress in height from short to tall with the diameter remaining constant.